Its not normal for maroons and carpet anemones, but they (the anemone) normally will pair with saddleback or clarkii clowns, also true and false percs and some others.
You got yourself one of the stickier anemones, sure hope you have a big enough tank for it, they get really big. Also hope you have MH lighting for this one.
Maroons have been known to pair with BTA's RBTA's and LTAs, Sebae's and a few others.
Welcome aboard